Gamma values and the VCOM value are programmed into registers through the I☬ interface. Picture a grayscale test pattern with reference black and white at each end, which are adjusted by the TV's brightness and contrast controls, respectively. The analog supply voltage range extends from 9V to 20V, and the digital supply voltage range extends from 2.7V to 3.6V. The VCOM output can provide 600mA peak transient current and also settles within 1µs. The gamma outputs can drive 200mA peak transient current and settle within 1µs. The MAX9669 supports up to 100 write operations to the on-chip nonvolatile memory. The MAX9669 features integrated multiple-time programmable (MTP) memory to store gamma and VCOM values on the chip, eliminating the need for external EEPROM. The VCOM reference voltage has its own 10-bit DAC and an amplifier to ensure a stable voltage when critical levels and patterns are displayed. Each gamma reference voltage has its own 10-bit digital-to-analog converter (DAC) and buffer to ensure a stable voltage. ![]() The MAX9669 outputs 16 voltage references for gamma correction in TFT LCDs and one voltage reference for VCOM. (You can also click the Reset button to move it. MAX9669:10-Bit Programmable Gamma Reference System with MTP for TFT LCDsġ0-Bit DAC Resolution and MTP Memory Provides Nonvolatile Memory, Eliminating the Need for External EEPROM A slider on the left side of the window should allow you to change your gamma settings by dragging it up or down.
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